midi out

William50

I am using the following code to try and send a midi note-on command:

con
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000

OBJ
out : "FullDuplexSerial"

Pub Main
out.start(9,7,%0000,31250)

repeat
out.tx(144)
out.tx(67)
out.tx(127)


Using a logic probe I can see data coming out of P7 however nothing is being played on my external midi synthesizer.

I know that the midi baud rate must be within a tight tolerance so I suspect that my _clkmode settings may be the problem.

hippy

I wouldn't have thought it's the _clkmode settings causing a problem, and MIDI usually has +/-6% tolerance like most other serial.

More likely to be a problem with signal polarity, hardware interface, or the synth isn't configured correctly.

Bob Lawrence (VE1RLL)

How is your MIDI out hardware wired?

In the dsPIC world I use MIDI out with the following:

+5V --> [noparse][[/noparse]220 ohm resistor] --> [noparse][[/noparse]MIDI connector pin 4]

Micro output on pin 6(Tx) --> [noparse][[/noparse]220 ohm resistor] --> [noparse][[/noparse]MIDI connector pin 5]

Connect pin 2 of the MIDI connector to ground

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Aka: CosmicBob

Post Edited (Bob Lawrence (VE1RLL)) : 3/22/2008 6:58:49 PM GMT

William50

Problem solved!

I had to set Bit2 when starting the FDS object.

It now reads:

out.start(9,7,%0100,31250)